单项选择题

We wish to receive your sample （） which we will pay upon receipt of your advice.

A．of
B．with
C．about
D．for

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单项选择题
We are a state-owned corporation （） the export of tablecloths.

A．specialized
B．specializing
C．specialized in
D．specializing in
单项选择题
The main purpose of the Customs supervision and control is to （） China, seconomic, trade, scientific, technological and cultural exchanges with other countries.

A．supervise
B．control
C．promote
D．limit
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